private static void SetFormat(InputControl control, InputControlLayout.ControlItem controlItem)
{
control.m_StateBlock.format = controlItem.format;
if (controlItem.sizeInBits == 0)
{
var primitiveFormatSize = InputStateBlock.GetSizeOfPrimitiveFormatInBits(controlItem.format);
if (primitiveFormatSize != -1)
{
control.m_StateBlock.sizeInBits = (uint)primitiveFormatSize;
}
}
}
private static void SetFormat(InputControl control, InputTemplate.ControlTemplate controlTemplate)
{
control.m_StateBlock.format = controlTemplate.format;
if (controlTemplate.sizeInBits == 0)
{
var primitiveFormatSize = InputStateBlock.GetSizeOfPrimitiveFormatInBits(controlTemplate.format);
if (primitiveFormatSize != -1)
{
control.m_StateBlock.sizeInBits = (uint)primitiveFormatSize;
}
}
}
private static void ComputeStateLayout(InputControl control)
{
var children = control.children;
// If the control has a format but no size specified and the format is a
// primitive format, just set the size automatically.
if (control.m_StateBlock.sizeInBits == 0 && control.m_StateBlock.format != 0)
{
var sizeInBits = InputStateBlock.GetSizeOfPrimitiveFormatInBits(control.m_StateBlock.format);
if (sizeInBits != -1)
{
control.m_StateBlock.sizeInBits = (uint)sizeInBits;
}
}
// If state size is not set, it means it's computed from the size of the
// children so make sure we actually have children.
if (control.m_StateBlock.sizeInBits == 0 && children.Count == 0)
{
throw new InvalidOperationException(
$"Control '{control.path}' with layout '{control.layout}' has no size set and has no children to compute size from");
}
// If there's no children, our job is done.
if (children.Count == 0)
{
return;
}
// First deal with children that want fixed offsets. All the other ones
// will get appended to the end.
var firstUnfixedByteOffset = 0u;
foreach (var child in children)
{
Debug.Assert(child.m_StateBlock.sizeInBits != 0, "Size of state block not set on child");
// Skip children using state from other controls.
if (child.m_StateBlock.sizeInBits == kSizeForControlUsingStateFromOtherControl)
{
continue;
}
// Make sure the child has a valid size set on it.
var childSizeInBits = child.m_StateBlock.sizeInBits;
if (childSizeInBits == 0 || childSizeInBits == InputStateBlock.InvalidOffset)
{
throw new InvalidOperationException(
$"Child '{child.name}' of '{control.name}' has no size set!");
}
// Skip children that don't have fixed offsets.
if (child.m_StateBlock.byteOffset == InputStateBlock.InvalidOffset ||
child.m_StateBlock.byteOffset == InputStateBlock.AutomaticOffset)
{
continue;
}
// At this point, if the child has no valid bit offset, put it at #0 now.
if (child.m_StateBlock.bitOffset == InputStateBlock.InvalidOffset)
{
child.m_StateBlock.bitOffset = 0;
}
// See if the control bumps our fixed layout size.
var endOffset =
MemoryHelpers.ComputeFollowingByteOffset(child.m_StateBlock.byteOffset, child.m_StateBlock.bitOffset + childSizeInBits);
if (endOffset > firstUnfixedByteOffset)
{
firstUnfixedByteOffset = endOffset;
}
}
////TODO: this doesn't support mixed automatic and fixed layouting *within* bitfields;
//// I think it's okay not to support that but we should at least detect it
// Now assign an offset to every control that wants an
// automatic offset. For bitfields, we need to delay advancing byte
// offsets until we've seen all bits in the fields.
// NOTE: Bit addressing controls using automatic offsets *must* be consecutive.
var runningByteOffset = firstUnfixedByteOffset;
InputControl firstBitAddressingChild = null;
var bitfieldSizeInBits = 0u;
foreach (var child in children)
{
// Skip children with fixed offsets.
if (child.m_StateBlock.byteOffset != InputStateBlock.InvalidOffset &&
child.m_StateBlock.byteOffset != InputStateBlock.AutomaticOffset)
{
continue;
}
// Skip children using state from other controls.
if (child.m_StateBlock.sizeInBits == kSizeForControlUsingStateFromOtherControl)
{
continue;
}
// See if it's a bit addressing control.
var isBitAddressingChild = (child.m_StateBlock.sizeInBits % 8) != 0;
if (isBitAddressingChild)
{
// Remember start of bitfield group.
if (firstBitAddressingChild == null)
{
firstBitAddressingChild = child;
}
// Keep a running count of the size of the bitfield.
if (child.m_StateBlock.bitOffset == InputStateBlock.InvalidOffset ||
child.m_StateBlock.bitOffset == InputStateBlock.AutomaticOffset)
{
// Put child at current bit offset.
child.m_StateBlock.bitOffset = bitfieldSizeInBits;
bitfieldSizeInBits += child.m_StateBlock.sizeInBits;
}
else
{
// Child already has bit offset. Keep it but make sure we're accounting for it
// in the bitfield size.
var lastBit = child.m_StateBlock.bitOffset + child.m_StateBlock.sizeInBits;
if (lastBit > bitfieldSizeInBits)
{
bitfieldSizeInBits = lastBit;
}
}
}
else
{
// Terminate bitfield group (if there was one).
if (firstBitAddressingChild != null)
{
runningByteOffset = MemoryHelpers.ComputeFollowingByteOffset(runningByteOffset, bitfieldSizeInBits);
firstBitAddressingChild = null;
}
if (child.m_StateBlock.bitOffset == InputStateBlock.InvalidOffset)
{
child.m_StateBlock.bitOffset = 0;
}
}
////FIXME: seems like this should take bitOffset into account
child.m_StateBlock.byteOffset = runningByteOffset;
if (!isBitAddressingChild)
{
runningByteOffset =
MemoryHelpers.ComputeFollowingByteOffset(runningByteOffset, child.m_StateBlock.sizeInBits);
}
}
// Compute total size.
// If we ended on a bitfield, account for its size.
if (firstBitAddressingChild != null)
{
runningByteOffset = MemoryHelpers.ComputeFollowingByteOffset(runningByteOffset, bitfieldSizeInBits);
}
var totalSizeInBytes = runningByteOffset;
// Set size. We force all parents to the combined size of their children.
control.m_StateBlock.sizeInBits = totalSizeInBytes * 8;
}